Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
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Countries with the most unannounced blocks, largest first.
Unannounced blocks in United States
26,993 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 149.112.68.0/24 | 256 | ARIN |  US | 10th May 2023 |
| 149.112.69.0/24 | 256 | ARIN | US | 11th Aug 2025 |
| 149.112.7.0/24 | 256 | ARIN | US | 20th Aug 2020 |
| 149.112.70.0/23 | 512 | ARIN | US | 21st Jul 2023 |
| 149.112.72.0/24 | 256 | ARIN | US | 7th Aug 2023 |
| 149.112.73.0/24 | 256 | ARIN | US | 30th Aug 2023 |
| 149.112.75.0/24 | 256 | ARIN | US | 9th Oct 2023 |
| 149.112.76.0/24 | 256 | ARIN | US | 9th Oct 2023 |
| 149.112.8.0/24 | 256 | ARIN | US | 16th Sept 2020 |
| 149.112.81.0/24 | 256 | ARIN | US | 28th Dec 2023 |
| 149.112.82.0/24 | 256 | ARIN | US | 28th Dec 2023 |
| 149.112.83.0/24 | 256 | ARIN | US | 2nd Jan 2024 |
| 149.112.85.0/24 | 256 | ARIN | US | 8th Feb 2024 |
| 149.112.86.0/23 | 512 | ARIN | US | 15th Feb 2024 |
| 149.112.88.0/24 | 256 | ARIN | US | 27th Feb 2024 |
| 149.112.94.0/24 | 256 | ARIN | US | 19th Apr 2024 |
| 149.112.95.0/24 | 256 | ARIN | US | 22nd Apr 2024 |
| 149.112.96.0/22 | 1k | ARIN | US | 19th Apr 2024 |
| 149.121.0.0/16 | 65.5k | ARIN | US | 26th Nov 1997 |
| 149.122.0.0/16 | 65.5k | ARIN | US | 19th Feb 1993 |
| 149.124.0.0/16 | 65.5k | ARIN | US | 3rd Mar 1993 |
| 149.131.128.0/20 | 4.1k | ARIN | US | 16th Apr 1991 |
| 149.131.144.0/21 | 2k | ARIN | US | 16th Apr 1991 |
| 149.131.152.0/21 | 2k | ARIN | US | 16th Apr 1991 |
| 149.131.160.0/19 | 8.2k | ARIN | US | 16th Apr 1991 |
| 149.131.192.0/18 | 16.4k | ARIN | US | 16th Apr 1991 |
| 149.137.208.0/22 | 1k | ARIN | US | 6th Apr 2020 |
| 149.141.0.0/16 | 65.5k | ARIN | US | 24th Apr 1991 |
| 149.145.0.0/16 | 65.5k | ARIN | US | 26th Apr 1991 |
| 149.19.5.0/24 | 256 | ARIN | US | 2nd Nov 2020 |
| 149.19.64.0/19 | 8.2k | ARIN | US | 8th Dec 2020 |
| 149.20.224.0/21 | 2k | ARIN | US | 26th Apr 2018 |
| 149.218.128.0/17 | 32.8k | ARIN | US | 7th Aug 2024 |
| 149.234.234.0/23 | 512 | ARIN | US | 25th Jan 2017 |
| 149.234.236.0/22 | 1k | ARIN | US | 25th Jan 2017 |
| 149.252.0.0/16 | 65.5k | ARIN | US | 9th Aug 1991 |
| 149.39.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.42.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.45.0.0/16 | 65.5k | ARIN | US | 12th Sept 2018 |
| 149.47.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.55.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 149.73.0.0/16 | 65.5k | ARIN | US | 26th Oct 1994 |
| 149.83.0.0/16 | 65.5k | ARIN | US | 1st Sept 1993 |
| 149.97.64.0/20 | 4.1k | ARIN | US | 29th Oct 2019 |
| 149.97.84.0/22 | 1k | ARIN | US | 29th Oct 2019 |
| 149.97.88.0/23 | 512 | ARIN | US | 29th Oct 2019 |
| 149.97.92.0/22 | 1k | ARIN | US | 29th Oct 2019 |
| 15.100.0.0/15 | 131k | ARIN | US | 1st Jul 1994 |
| 15.102.0.0/16 | 65.5k | ARIN | US | 1st Jul 1994 |
| 15.104.0.0/13 | 524k | ARIN | US | 1st Jul 1994 |